反应详情

To a solution of diethylamine (2.53 g, 34.59 mmol) and Et3N (3.82 g, 37.75 mmol) in EtOAc (40 mL) was added 3,4-difluoronitrobenzene (5.00 g, 31.43 mmol) dropwise over a period of 30 min in an ice bath. Upon the end of addition the reaction was warmed to rt slowly, and solid was precipitated out. The mixture was filtered. The filter cake was washed with an appropriate amount of water, and dried in vacuo to obtain the 1st crop of product. The filtrate was extracted with EtOAc. The combined organic phases were dried over anhydrous Na2SO4 and concentrated in vacuo to obtain the 2nd crop of product. The solids of 1st crop and 2nd crop were combined to give the title compound as a yellow solid (7.20 g, 99%).

1. additionUpon the end of addition the reaction
2. customsolid was precipitated out
3. filtrationThe mixture was filtered
4. washThe filter cake was washed with an appropriate amount of water
5. customdried in vacuo
6. customto obtain the 1st crop of product
7. extractionThe filtrate was extracted with EtOAc
8. dry with materialThe combined organic phases were dried over anhydrous Na2SO4
9. concentrationconcentrated in vacuo
10. customto obtain the 2nd crop of product